CN109617088B - Reactive power and harmonic compensation method and system - Google Patents
Reactive power and harmonic compensation method and system Download PDFInfo
- Publication number
- CN109617088B CN109617088B CN201811423157.XA CN201811423157A CN109617088B CN 109617088 B CN109617088 B CN 109617088B CN 201811423157 A CN201811423157 A CN 201811423157A CN 109617088 B CN109617088 B CN 109617088B
- Authority
- CN
- China
- Prior art keywords
- current
- compensation
- harmonic
- reactive
- priority
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
According to the reactive and harmonic compensation method and system, when the capacity of the compensation device is smaller than the capacity required by the system for compensation: determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current; when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy; wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: the final compensation current is determined based on the three-phase current peak value of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device, two methods of the limited compensation reactive current and the limited compensation harmonic current are provided, the reasonable distribution of the reactive power and the harmonic compensation is realized, and no extra reactive power and harmonic current is generated.
Description
Technical Field
The invention relates to the field of power quality control of a power distribution network, in particular to a reactive power and harmonic compensation method and system.
Background
With the development of modern industry, nonlinear loads (such as thyristor rectifier devices, arc furnaces, household appliances and the like) in power grids are greatly increased, so that the reactive power and harmonic problems in the power grids are increasingly serious. The idle work and the harmonic wave can increase the extra additional loss of power transmission, power supply and utilization equipment and a power transmission line, reduce the utilization rate and the economic benefit of the equipment and shorten the service life of the equipment. In order to improve the quality of electric energy, increase the power factor and the efficiency of electricity, save energy and reduce loss, harmonic and reactive power compensation devices (such as Static Var Compensator (SVC), static var generator (STATCOM or SVG), active Power Filter (APF)) are widely used. High performance APF and STATCOM devices generally have the capability of compensating reactive power and harmonic waves at the same time, but when the device capacity is smaller than the reactive power and harmonic wave capacity required by the system to compensate, the device cannot completely compensate the reactive power and harmonic wave required by the system due to the amplitude limit of the device capacity, and additional reactive power and harmonic wave can be generated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a reactive power and harmonic compensation method and system.
The technical scheme provided by the invention is as follows:
a reactive and harmonic compensation method, the method comprising:
when the capacity of the compensation device is smaller than the capacity of the system required compensation:
determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current;
when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
Preferably, the reactive current priority compensation strategy includes:
obtaining reactive current, harmonic current, pure reactive current and specified harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limit values, the total compensation current is the final compensation current;
otherwise, generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and comparing the reactive and specified harmonic currents with the compensation current limiting value to determine the final compensation current.
Preferably, the generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and determining a final compensation current by comparing with the compensation current limiting value, includes:
sequencing all the designated harmonic currents in sequence based on the importance degree of the designated harmonic currents;
sequentially generating corresponding reactive power and designated harmonic current based on the sequenced designated harmonic current;
comparing the three-phase current peak value of the first reactive and specified harmonic current with the current limiting value;
and until the three-phase current peak values of the reactive and designated harmonic currents are smaller than the current limiting value, or the current is carried out to the last one of the designated harmonic currents, and the previous reactive and designated harmonic currents are used as final compensation currents.
Preferably, the corresponding reactive and designated harmonic currents are sequentially generated based on the sorted designated harmonic currents, and the calculation formula is as follows:
in the formula i x1 、i x2 、…，i xn A reactive and specified harmonic current command is given; i.e. i x0 The instruction is a pure reactive current instruction; i all right angle xh1 、i xh2 …i xhn To specify the harmonic current, where n is the number of specified harmonic currents.
Preferably, the harmonic current priority compensation strategy includes:
obtaining the maximum value of the three-phase current peak values of the reactive current and the harmonic current based on the reactive current and the harmonic current;
calculating compensation allowance based on the maximum value of the three-phase current peak value of the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing by an amplitude limiter based on the allowance;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
Preferably, the compensation margin is calculated based on the maximum value of the harmonic current three-phase peak value and the current limit value, and the calculation formula is as follows:
I q0 ＝I lim -I hmax
in the formula I q0 To compensate for the margin; i is lim Is a current limiting value; I.C. A hmax The maximum value of the harmonic current peak.
Preferably, the calculating of the final compensation current based on the processed compensation margin, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current includes:
in the formula i x * To the final compensation current; i is q Compensating allowance for the processed compensation allowance; i is qmax Maximum value of reactive current three-phase current peak value; i.e. i xh Three-phase current which is harmonic current; i all right angle x0 Three-phase current which is reactive current.
A reactive and harmonic compensation system, the system comprising:
a determination module: when the capacity of the compensation device is smaller than the capacity of the system required compensation:
determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current;
an execution module: the reactive current priority compensation strategy is executed when the priority compensation current is reactive current; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
Preferably, the execution module includes: a reactive current priority compensation submodule;
the reactive current priority compensation submodule is used for acquiring reactive current, harmonic current, pure reactive current and specified harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limit values, the total compensation current is the final compensation current;
otherwise, generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and comparing the reactive and specified harmonic currents with the compensation current limiting value to determine the final compensation current.
Preferably, the execution module further includes: a harmonic current priority compensation submodule;
the harmonic current priority compensation submodule is used for acquiring the maximum values of three-phase current peak values of reactive current and harmonic current based on the reactive current and the harmonic current;
calculating compensation allowance based on the maximum value of the three-phase current peak value of the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing through an amplitude limiter based on the residual quantity;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
Compared with the prior art, the invention has the beneficial effects that:
according to the reactive and harmonic compensation method and system, when the capacity of the compensation device is smaller than the capacity required by the system to compensate: determining the prior compensation current as the reactive current or the harmonic current based on the compensation current demand of the reactive current and the harmonic current; when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy; wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: the final compensation current is determined based on the three-phase current peak value of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device, two methods of the limited compensation reactive current and the limited compensation harmonic current are provided, the reasonable distribution of the reactive power and the harmonic compensation is realized, and no extra reactive power and harmonic current is generated.
Drawings
FIG. 1 is a flow chart of the reactive and harmonic compensation method of the present invention;
FIG. 2 is a flow chart of the reactive and harmonic compensation distribution with preferential reactive compensation of the present invention;
FIG. 3 is a flow chart of the output selection link for reactive and harmonic compensation distribution with priority reactive compensation of the present invention;
FIG. 4 is a flow chart of the amplitude limiting judgment link for reactive and harmonic compensation allocation with priority on reactive compensation according to the present invention;
FIG. 5 is a flow chart of reactive and harmonic compensation allocation with priority harmonic compensation according to the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
The invention provides a reactive power and harmonic compensation method which can realize reasonable distribution of reactive power and harmonic compensation when the device capacity is smaller than the reactive power and harmonic compensation capacity required by a system. As shown in fig. 1, the specific steps are as follows:
the method comprises the following steps: when the capacity of the compensation device is smaller than the capacity of the system requiring compensation:
determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current;
step two: when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
Example 1:
the method comprises the following steps: when the capacity of the compensation device is smaller than the capacity of the system required compensation:
determining the prior compensation current as the reactive current or the harmonic current based on the compensation current demand of the reactive current and the harmonic current;
the reactive power is firstly used as a compensation principle, namely, the compensation device is used for compensating the reactive current required by the system firstly and then compensating the harmonic current required by the system on the premise of not exceeding the capacity of the device. The compensation method comprises a reactive current and harmonic current instruction link, an instruction current amplitude limiting judgment link and an instruction current output selection link.
The harmonic wave is preferred as a compensation principle, namely, the compensation device is preferred to compensate the harmonic wave current required by the system, and then compensates the reactive current required by the system on the premise of not exceeding the capacity of the device.
Step two: when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
When reactive power is taken as the priority for compensation, the method specifically comprises the following steps:
(1): generating reactive and harmonic current commands by a reactive current and harmonic current command link;
(2): comparing the three-phase current command peak values by a command current amplitude limiting judgment link to judge whether the peak values exceed the current amplitude limiting value of the compensation device;
(3): and (3) selecting a corresponding current instruction as a final compensation current instruction of the compensation device according to the amplitude limiting judgment result in the step (2).
In (1), a reactive + harmonic current command i is generated by a reactive current and harmonic current command link xqh (where subscript x = a, b, c, denoting three phases a, b, c, the same applies below), pure reactive current command i x0 Specified harmonic current i xh1 A specified harmonic current i xh2 8230and a specified harmonic current i xhn (n is the maximum specified harmonic current amount). Wherein the reactive + harmonic current command i xqh The command current is the total command current for simultaneously compensating the reactive power and the harmonic wave, the specified harmonic wave currents are sequentially ordered according to the importance degree, and the reactive power and the specified harmonic wave current commands i are sequentially generated according to the following formula (1) x1 、i x2 、…，i xn 。
In (2), the current instruction generated in the step (1) is input to the amplitude limiting judgment link, and the peak value of the current instruction and the current amplitude limiting value I of the compensation device are subjected to lim Comparing, if one phase of the three phases of the command current peak value is larger than the amplitude limiting value I lim If not, the amplitude judgment link outputs logic '1', otherwise, the amplitude judgment link outputs logic '0'. The method comprises the following specific steps:
as shown in fig. 2 and 3, the reactive + harmonic current command i generated in step 1 is first applied xqh Is judged if three phases i xqh The peak has one phase greater thanThe amplitude limiting value I lim If not, the amplitude limiting judgment link outputs L = '1', otherwise, the amplitude limiting judgment link outputs L = '0'.
Then the reactive and specified harmonic current instruction i generated in the step 1 is processed xk (wherein subscript x = a, b, c, k =1, 2.. Times.n, the same applies hereinafter) and the three phases i are judged if the peak values are sequentially judged xk The peak value has one phase larger than the amplitude limiting value I lim If so, outputting L corresponding to the amplitude limiting judgment link k = '1', otherwise output L respectively k ＝“0”。
In (3), as shown in fig. 4, the detailed steps are as follows:
3.1: firstly, judging L output in the step 2, and if L is not equal to '1', finally compensating a current instruction i by a compensating device x * ＝i xqh Otherwise, let k =1, continue the next step;
3.2: for L output in step 2 k Making a judgment if L k Equal to '1', the compensation device finally compensates the current command i x * ＝i x(k-1) Otherwise, let k = k +1, continue the next step;
3.3: if k is greater than n (n is the maximum specified harmonic current amount), the compensation device finally compensates the current command i x * ＝i x(k-1) And ending, otherwise, returning to the step 3.2.
When the harmonic is first used as compensation, as shown in fig. 5, the method specifically includes the following steps:
<1>: respectively calculating three-phase harmonic command current i xh And three-phase reactive current i x0 Peak maximum value of hmax And I qmax ；
<2>: current limiting value I with compensation device lim Subtract I hmax Obtaining a compensation device margin I q0 I.e. I q0 ＝I lim -I hmax Is subjected to amplitude limiting processing by an amplitude limiter to obtain I q The amplitude limiter has an amplitude limiting value of I qmax ；
<3>: three-phase reactive current i x0 Are respectively multiplied by
Then with three-phase harmonic command current i xh Adding the current values to obtain a final compensation current instruction i of the compensation device x * I.e. by
Example 2:
based on the same inventive concept, the invention also provides a reactive and harmonic compensation system, which comprises:
the determining module: when the capacity of the compensation device is smaller than the capacity required by the system to compensate:
determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current;
an execution module: the reactive current priority compensation strategy is executed when the priority compensation current is reactive current; when the priority compensation current is harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
The execution module comprises: a reactive current priority compensation submodule;
the reactive current priority compensation submodule is used for acquiring reactive current, harmonic current, pure reactive current and specified harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limiting value, the total compensation current is the final compensation current;
otherwise, generating reactive and designated harmonic currents based on the pure reactive current and the designated harmonic current, and comparing the reactive and designated harmonic currents with the compensation current limiting value to determine the final compensation current.
The execution module further comprises: a harmonic current priority compensation submodule;
the harmonic current priority compensation submodule is used for acquiring the maximum value of three-phase current peak values of reactive current and harmonic current based on the reactive current and the harmonic current;
calculating compensation allowance based on the maximum value of the three-phase current peak value of the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing through an amplitude limiter based on the residual quantity;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (7)
1. A reactive and harmonic compensation method, the method comprising:
when the capacity of the compensation device is smaller than the capacity of the system required compensation:
determining the prior compensation current as the reactive current or the harmonic current based on the compensation current demand of the reactive current and the harmonic current;
when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device;
the reactive current priority compensation strategy comprises the following steps:
obtaining reactive current, harmonic current, pure reactive current and appointed harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limiting value, the total compensation current is the final compensation current;
otherwise, generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and comparing the reactive and specified harmonic currents with the compensation current limiting value to determine final compensation current;
the generating of reactive and designated harmonic currents based on the pure reactive current and designated harmonic currents, determining a final compensation current by comparing with the compensation current limiting value, comprising:
sequencing all the appointed harmonic currents in sequence based on the importance degree of the appointed harmonic currents;
sequentially generating corresponding reactive power and designated harmonic current based on the sequenced designated harmonic current;
comparing the three-phase current peak value of the first reactive and specified harmonic current with the current limiting value;
until one phase of three-phase current peak values of the reactive and designated harmonic currents is larger than the current limiting value, or the current reaches the last phase of the designated harmonic currents, and the previous reactive and designated harmonic currents are used as final compensation currents;
and sequentially generating corresponding reactive and designated harmonic currents based on the sequenced designated harmonic currents, wherein the calculation formula is as follows:
in the formula i x1 、i x2 、…，i xn Assigning a harmonic current command for idle and designated; i all right angle x0 The command is a pure reactive current command; i.e. i xh1 、i xh2 …i xhn To specify the harmonic current, where n is the number of specified harmonic currents.
2. The reactive and harmonic compensation method of claim 1 wherein the harmonic current-first compensation strategy comprises:
calculating compensation allowance based on the maximum value of the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing by an amplitude limiter based on the allowance;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
3. The reactive and harmonic compensation method according to claim 2, wherein the compensation margin is calculated based on the maximum value of the reactive current and harmonic current three-phase current peak values and the current limit value, and the calculation formula is as follows:
I q0 ＝I lim -I hmax
in the formula I q0 To compensate for the margin; i is lim Is a current limiting value; i is hmax The maximum value of the harmonic current peak.
4. A reactive and harmonic compensation method according to claim 3 wherein the calculating of the final compensation current based on the processed compensation headroom, the maximum of the reactive current three-phase current peaks and the three-phase currents of the harmonic currents comprises:
in the formula i x * To the final compensation current; i is q The compensation allowance after the treatment is obtained; I.C. A qmax The maximum value of the reactive current three-phase current peak value; i.e. i xh Three-phase electricity as harmonic currentA stream; i.e. i x0 Is a three-phase current of reactive current.
5. A reactive and harmonic compensation system using the reactive and harmonic compensation method according to any one of claims 1 to 4, wherein the system comprises:
a determination module: when the capacity of the compensation device is smaller than the capacity required by the system to compensate:
determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current;
an execution module: the reactive current priority compensation strategy is executed when the priority compensation current is reactive current; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
6. The reactive and harmonic compensation system of claim 5 wherein the execution module comprises: a reactive current priority compensation submodule;
the reactive current priority compensation submodule is used for acquiring reactive current, harmonic current, pure reactive current and specified harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limiting value, the total compensation current is the final compensation current;
otherwise, generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and comparing the reactive and specified harmonic currents with the compensation current limiting value to determine the final compensation current.
7. The reactive and harmonic compensation system of claim 6 wherein the execution module further comprises: a harmonic current priority compensation submodule;
the harmonic current priority compensation submodule is used for acquiring the maximum values of three-phase current peak values of reactive current and harmonic current based on the reactive current and the harmonic current;
calculating compensation allowance based on the maximum value of the three-phase current peak value of the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing by an amplitude limiter based on the allowance;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811423157.XA CN109617088B (en) | 2018-11-27 | 2018-11-27 | Reactive power and harmonic compensation method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811423157.XA CN109617088B (en) | 2018-11-27 | 2018-11-27 | Reactive power and harmonic compensation method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109617088A CN109617088A (en) | 2019-04-12 |
| CN109617088B true CN109617088B (en) | 2022-11-11 |
Family
ID=66004775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811423157.XA Active CN109617088B (en) | 2018-11-27 | 2018-11-27 | Reactive power and harmonic compensation method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109617088B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118336748B (en) * | 2024-06-13 | 2024-08-13 | 法拉迪电气有限公司 | Reactive power compensation optimization control method, equipment and medium for new energy grid connection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356470A (en) * | 2015-11-26 | 2016-02-24 | 东南大学 | Dynamic coordination control method of high-power APF parallel-machine harmonic compensation system |
| CN105490274A (en) * | 2015-12-28 | 2016-04-13 | 国网山东省电力公司青岛供电公司 | Electric power quality control system and method for metro power supply system |
| KR101644455B1 (en) * | 2015-12-31 | 2016-08-02 | (주)파워닉스 | Multi-Purpose Active Filter for Compensating Reactive Power and Harmonic Distortion |
| CN107332245A (en) * | 2017-08-29 | 2017-11-07 | 云南电力试验研究院(集团)有限公司 | A kind of harmonic wave and idle administering method |
-
2018
- 2018-11-27 CN CN201811423157.XA patent/CN109617088B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356470A (en) * | 2015-11-26 | 2016-02-24 | 东南大学 | Dynamic coordination control method of high-power APF parallel-machine harmonic compensation system |
| CN105490274A (en) * | 2015-12-28 | 2016-04-13 | 国网山东省电力公司青岛供电公司 | Electric power quality control system and method for metro power supply system |
| KR101644455B1 (en) * | 2015-12-31 | 2016-08-02 | (주)파워닉스 | Multi-Purpose Active Filter for Compensating Reactive Power and Harmonic Distortion |
| CN107332245A (en) * | 2017-08-29 | 2017-11-07 | 云南电力试验研究院(集团)有限公司 | A kind of harmonic wave and idle administering method |
Non-Patent Citations (2)
| Title |
|---|
| MMC型微网复合主动电力调节系统协调控制策略研究;陆晶晶;《中国优秀博硕士学位论文全文数据库(博士)》;20160115;第50-55页 * |
| 链式STATCOM综合补偿限流控制方法的研究;梁勇等;《电力电子技术》;20180131;第52卷(第1期);第116-119页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109617088A (en) | 2019-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ye et al. | Optimization of the size of UPQC system based on data-driven control design | |
| Sheng et al. | CDFLOW: A practical tool for tracing stationary behaviors of general distribution networks | |
| CN104485830B (en) | Method for reducing capacitance value of modular multilevel converter | |
| Hashempour et al. | Real-time supervisory control for power quality improvement of multi-area microgrids | |
| CN110086173B (en) | Parallel APF harmonic amplification effect suppression method and system | |
| CN108281973A (en) | A kind of MMC nonlinear control methods based on sliding formwork control | |
| CN109617088B (en) | Reactive power and harmonic compensation method and system | |
| Costabeber et al. | Selective compensation of reactive, unbalance, and distortion power in smart grids by synergistic control of distributed switching power interfaces | |
| CN112117766A (en) | Safety constraint optimal power flow control method and system for alternating current-direct current hybrid power grid | |
| CN105186545B (en) | A kind of the current balance type control method and inverter of inverter | |
| Das et al. | Fuzzy Controller Designed Based Multilevel Inverter for Power Quality Enhancement | |
| CN109617087B (en) | Reactive and harmonic self-adaptive compensation method and system | |
| Hu et al. | An optimal frequency control method of asynchronous power grid considering multi-HVDC emergency power support | |
| WO2024066820A1 (en) | Harmonic voltage suppression method and system for hybrid dc transmission system, and device and medium | |
| CN109301827B (en) | Harmonic control method and system based on automatic identification and hierarchical treatment of harmonic source | |
| CN116760268A (en) | Harmonic control method and system suitable for grid-connected converter | |
| Vásquez et al. | Three phase four-wire inverter for grid-disconnected operation | |
| Song et al. | A novel DC-link voltage control for small-scale grid-connected wind energy conversion system | |
| Rezvani et al. | Unified AC-DC load flow via an alternate AC-equivalent circuit | |
| Ye et al. | Optimization of the size of UPQC system based on data-driven control design | |
| El-Saady et al. | Particle-swarm optimization control of active-power filter for harmonic mitigation of hybrid electric-unbalanced traction-system | |
| CN111224400A (en) | Electric energy quality treatment device and electric energy compensation method thereof | |
| CN111342472B (en) | SVC (static var compensator) optimization control method and device for inhibiting direct-current continuous commutation failure | |
| CN111416377B (en) | Flexible direct current control method and device for improving transient stability of power grid | |
| CN114844081A (en) | Battery energy storage system, control method and device thereof, energy storage type UPS system and central controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |